CVE-2020-26262
coturn - security update
描述
Coturn is free open source implementation of TURN and STUN Server. Coturn before version 4.5.2 by default does not allow peers to connect and relay packets to loopback addresses in the range of `127.x.x.x`. However, it was observed that when sending a `CONNECT` request with the `XOR-PEER-ADDRESS` value of `0.0.0.0`, a successful response was received and subsequently, `CONNECTIONBIND` also received a successful response. Coturn then is able to relay packets to the loopback interface. Additionally, when coturn is listening on IPv6, which is default, the loopback interface can also be reached by making use of either `[::1]` or `[::]` as the peer address. By using the address `0.0.0.0` as the peer address, a malicious user will be able to relay packets to the loopback interface, unless `--denied-peer-ip=0.0.0.0` (or similar) has been specified. Since the default configuration implies that loopback peers are not allowed, coturn administrators may choose to not set the `denied-peer-ip` setting. The issue patched in version 4.5.2. As a workaround the addresses in the address block `0.0.0.0/8`, `[::1]` and `[::]` should be denied by default unless `--allow-loopback-peers` has been specified.
如何修補 CVE-2020-26262
要修補 CVE-2020-26262,請將受影響套件升級到下列已修補版本。
- —升級至 4.5.2-1 或更新版本
- —升級至 4.5.0.5-1+deb9u3 或更新版本
- —升級至 4.5.1.1-1.1+deb10u2 或更新版本
CVE-2020-26262 正在被利用嗎?
低 — EPSS 為 1.3%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- from 0, < 4.5.2-1
- from 0, < 4.5.0.5-1+deb9u3
- from 0, < 4.5.1.1-1.1+deb10u2
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N |